The piece is worked in the round with
double pointed needles, top down.

Cast on 48(52)56 sts with double pointed needles size
2.5 mm, divide sts evenly on 4 needles = 12(13)14 sts on each needle.
Work in rib (= knit 1 purl 1) for 7 rounds. Note! If you want to, add an
elastic thread while knitting the rib. Change to double pointed needles size 3.5
mm.
Work in stockinette/stocking sts (= knit all rounds). Decrease on round 1 2 sts
evenly on needle 2 and needle 3. Knit 1 round. HEEL
Work in stockinette/stocking sts , back and forth on needle 1 and 2 for
16(16)20 rows (last row = wrong side). On next row (= right side) make short
rows and decreases as follows: knit 14, knit 2 together through backloops, knit
1, turn piece, slip 1 purlwise, purl 5, purl 2 together, purl 1, turn piece,
slip 1, knit 6, knit 2 together through backloops, knit 1, turn piece, slip 1
purlwise, purl 7, purl 2 together, purl 1, turn piece. Continue to decrease in
this way until all sts on side are knitted.
Continue in stockinette/stocking sts on needle 1 and 2. Pick
up/knit up 13(13)15 sts on right side of piece ( = needle 2), work in
stockinette/stocking sts on needle 3 and 4, pick up/knit up 13(13)15 sts on
left side of piece and continue with remaining sts from heel (= needle 1).
Work 1 round in stockinette/stocking sts on all needles. Decrease 1 on needle 3.
NOTE! Sts on needle 3 and needle 4 = top of foot. Work in pattern as described
on needle 3 and 4 and in stockinette on needle 1 and 2. On next round decrease
on needle 1 and needle 2 as follows: (it is the newly picked up sts that will
be decreased):On needle 2: At the end
knit 2 together. On needle 1: At the beginning knit 2 together in backloops.
Repeat decrease every other round until 43(47)51 sts remains. Put remaining sts
evenly on 4 needles. FOOT
Continue in pattern and stockinette/stocking sts until foot measures 17-18(19-20)21-22
cm. TOE
Decrease on needle 1 and needle 3 as follows: knit 1, knit 2 together, knit
remaining sts. On needle 2 and 4: Knit until 3 sts remain, knit 2 together in
backloops, knit 1. Repeat decrease every other round 12 sts remain on needle 1
and 2, and 11 sts on needle 3 and 4. Cut yarn and pull it through the remaining
sts. Tighten and fasten well.